Question

我有UIImageView我可以向此UIImageView添加新项目（作为子视图），或者我可以移动＆amp;旋转UIImageView中的项目。我试图对这些项目进行撤消操作，所以我的代码;

在每次新操作之前，我都会获得UIImageView的副本并将其存储在NSMutableArray

中

[self.lastActions addObject:[self getCopy]];

我得到了具有不同内存地址的相同UIImageView。（我不确定这是正确的做法）

-(UIImageView *)getCopy{
    NSData *archivedViewData = [NSKeyedArchiver archivedDataWithRootObject:self.imageView];
    id clone = [NSKeyedUnarchiver unarchiveObjectWithData:archivedViewData];
    return clone;
}

当我进行撤消时;

-(IBAction)undoButtonClicked:(id)sender{

    UIImageView *lastImageView = [self.lastActions lastObject];

    [UIView animateWithDuration:0.1 animations:^{
        self.imageView = lastImageView;
    }];

    [self.lastActions removeObject:lastImageView];     
}

但它不会改变屏幕上的UIImageView。我的代码上有什么错误的想法吗？

Answer 1

我正在尝试你的上述想法。无法获得输出。这是实现同样目标的另一个想法。我正在使用图像在同一图像视图上显示图像变化＆＃34;撤消＆＃34;操作。我已经实现了如下方法。

它在我身边工作得很好。我希望这会对我们有所帮助。

//撤消按钮操作

-(IBAction)undoButtonClicked:(id)sender{
      UIImage *lastImageView =  lastImageView = (UIImage *)[lastActions lastObject];

     if( [lastActions count]!=0) {
           [UIView animateWithDuration:0.2 animations:^{
           self.imageView.image = lastImageView;
           }];

           [lastActions removeObject:lastImageView];
      }
}

//从公共变量self.imageview

复制图像

-(IBAction)copyButton:(id)sender{

    [lastActions addObject:self.imageView.image];

}

//随机方向更改以旋转图像。

-(UIImageOrientation )randonImageOrientation {

   int min = 0 ;
   int max = 3;
   UIImageOrientation ori;
   int randomNumber = min + rand() % (max-min);

   switch (randomNumber)
   {
    case 0 :
        ori = UIImageOrientationDown;
        break;

    case 1:
        ori = UIImageOrientationLeft;
        break;

    case 2:
        ori = UIImageOrientationRight;
        break;
    case 3:
        ori = UIImageOrientationUp;
        break;
    default :
        ori = UIImageOrientationUp;
        break;

   }
return  ori;
}

//下面用于旋转图像的方法

 -(UIImage *)imageOrientation :(UIImageOrientation)imageOri image:(UIImage *)oriImage {

   UIImage * LandscapeImage = oriImage;
   UIImage * PortraitImage = [[UIImage alloc] initWithCGImage: LandscapeImage.CGImage
                                                     scale: 0.5
                                               orientation: imageOri];
   return PortraitImage;
 }

iOS如何进行撤消操作以旋转，缩放和添加UIView到UIIMageView

1 个答案: